BRIDE STRADIA III Reclining Bucket Seat

The BRIDE STRADIA III is the brand’s new flagship reclining seat, built around a newly designed monocoque body shell and bone frame developed using the same 3D-CAD process applied to the ZETA IV. This shared development foundation results in a significant step forward in seat rigidity and structural strength compared to the STRADIA II, producing a reclining seat that no longer asks the driver to trade off the stability of a fixed-back design against the convenience of a recline function. The reclining mechanism is central to what makes the STRADIA III a genuine upgrade over its predecessor. Newly developed with maximum operability, convenience, and long-term durability as its design goals, the mechanism uses stepwise adjustment to suppress backlash and vibration across the full range of positions. A one-touch reclining lever makes angle changes straightforward without requiring the driver to reposition themselves, and the reduced backlash means the seat holds its set angle with a solidity that is more consistent with a fixed bucket than a conventional reclining sports seat.

A New Frame & Shell Designed Using 3D-CAD

• The innovative bone frame and body shell with a monocoque structure that inherits the design of ZETA IV are shaped to envelop the shoulders with more emphasis on hold performance. As a result, the load capacity of the frame has increased by 200%, the torsional strength by 40%, and the frontal collision strength of the backrest by 15% compared to STRADIA II.

A Newly Developed Stepped Reclining Mechanism

• The reclining mechanism has been renewed to achieve a compact design while allowing significantly improvements in precision and strength. In addition, backlash (play) and looseness, often found in stepped adjustment mechanisms, have been reduced to the utmost, achieving more reliable hold and comfort.

A One-Touch Reclining Level With Excellent Functionality

• In the previous model, the backrest angle adjustment came in dial form, but in STRADIA III, a one-touch reclining lever has been adopted for operability, convenience, durability and saving on in-vehicle space.

Utilizing The LOWMAX System, Which Enable The Maximum Low Driving Position

• Because STRADIA series utilizes BRIDE’s patented LOWMAX System technology, it enables a low position even in a tight seat space. Even if offsets between the steering and seat centers occur, with the LOWMAX System it is possible to set the offset to zero*. (In some cases, certain models may not reach zero)

BRIDE’s New Flagship Model

• A new-generation reclining seat that combines a high level of hold ability and convenience.
• STRADIA III has a newly designed monocoque body shell with a bone frame and ZETA IV designed by 3D-CAD. The seat rigidity and strength of STRADIA III have been greatly improved compared to STRADIA II. In addition, its newly-developed reclining mechanism and one-touch reclining lever, which aim at maximal operability, convenience, and durability, achieve more reliable hold ability and comfort by suppressing backlash and vibrations through stepwise adjustments. What’s more, a belt hole for a 6-point harness has been newly installed on the back of the seat, which uses a specially designed high-density urethane foam for its seat and thigh cushions.
• STRADIA III is a new-generation reclining seat that combines the hold ability required for circuit driving with the convenient and comfort required for everyday use at a high level.
• It is available in three colors, namely gradation logo, black and red, two types of shell, namely FRP silver shell and super aramid black shell, and two types of cushions, namely standard and low type.

Specially Designed Seat and Thigh Cushions

• The specially designed, high-density foam molded urethane used for the seat and high cushions applies body pressure evenly to the flat seat surface in order to provide a strong hold and reduce fatigue. What’s more, it does not easily squish and has excellent durability. In addition to the standard type, a low-type thigh cushion with a thickness reduced to 2/3 is also available.

Belt Holes Compatible With An FHR System and 6-Point Harness

• A large-diameter belt hole compatible with FHR systems such as HANS, as well as a 6-point harness belt hole, which has often been requested by STRADIA users, have been newly-installed at the bottom of the seat. This allows drivers to enjoy circuit driving and various other motor sports in greater safety.

Seat Rail Compatibility

• RO
• RB
• RK
• LR

Frequently Asked Questions

• What improvements does the STRADIA III make over the STRADIA II? The STRADIA III introduces a newly designed monocoque body shell and bone frame developed using 3D-CAD, delivering significantly improved seat rigidity and structural strength compared to the STRADIA II. The reclining mechanism has also been completely redesigned, with stepwise adjustment that suppresses backlash and vibration throughout the range of positions, and a new one-touch lever for faster and easier angle changes. A 6-point harness belt hole has also been added to the STRADIA III, a feature not present on the STRADIA II.
• How does the one-touch reclining mechanism work on the STRADIA III? The STRADIA III uses a one-touch lever to operate the reclining mechanism, allowing the driver to adjust the seatback angle across multiple stepwise positions without needing to reposition themselves. The stepwise adjustment design suppresses backlash and vibration throughout the range, meaning the seat holds its set angle firmly rather than shifting or flexing once locked. The result is a reclining mechanism that combines the ease of a one-touch operation with the positional stability of a more rigid fixed system.
• Does the STRADIA III support 6-point harnesses? Yes. The STRADIA III has a 6-point harness belt hole integrated into the back of the seat. This allows a competition-spec harness to be routed correctly without modification to the seat or vehicle structure, making the STRADIA III compatible with both standard road seatbelts and 6-point harness configurations.
• What cushion options are available for the STRADIA III? The STRADIA III is available in two cushion configurations; a standard type and a low type. Both use specially designed high-density urethane foam for the seat and thigh sections. The low type is suited to drivers who prefer or require a lower overall seating position within their vehicle, and both types can be specified independently of the shell or color choice.
• What shell and color options are available for the STRADIA III? The STRADIA III is available in two shell options: an FRP silver shell and a super aramid black shell. The super aramid shell uses high-strength aramid fiber for a stiffer and lighter alternative to the FRP option. Three color variations are available across both shell types: gradation logo, black, and red.
• How does the STRADIA III compare to the GIAS III? Both the STRADIA III and GIAS III are reclining bucket seats with monocoque shells, 6-point harness compatibility, high-density urethane cushions in standard and low types, and the same three color options. The key distinction is that the STRADIA III is BRIDE’s flagship reclining model, sharing its 3D-CAD shell and bone frame development process with the ZETA IV, and uses a super aramid black shell as its premium shell option. The GIAS III uses a carbon shell as its premium option. Both seats are designed to combine circuit hold with daily usability, but the STRADIA III represents the higher specification within the BRIDE reclining lineup.
• Is the BRIDE STRADIA III FIA approved? The source material provided does not specify FIA approval for the STRADIA III. Please confirm FIA compliance status with Bulletproof Automotive before purchasing if FIA certification is a requirement for your intended use.

About BRIDE

BRIDE is a Japan-based manufacturer specializing in seats and rail components designed to sit closest to the driver, offering maximum protection in a collision. Their ASEA-accredited products meet full vehicle inspection standards and pass six rigorous safety tests covering seat back impact, head restraint performance, seat and belt mounting, and flame resistance. BRIDE is also the first Japanese company to receive FIA endorsement for its seats, with nine models approved for international competition. Every seat is built by hand in Japan using precision-engineered shells and technical fabrics, with all components sourced domestically to keep quality tightly controlled from start to finish. For BRIDE, “Made in Japan” reflects a long-held standard built on ingenuity, meticulous craftsmanship, and technical knowledge; qualities that make their seats a trusted choice in the demanding environment of motorsport.